The normalization of the form factors at \(q^{2}=0\)  can be expressed in terms of \(g_{+}(q^2), g_{-}(q^2)\) , \(h(q^2)\)  and \(h_{1}(q^2)\) 
which are discussed in detail in Refs. [1]}, [2]}. Namely, we me make use of
\(\langle V(k,\varepsilon ^{\ast })|\bar{s} i\sigma _{\alpha \beta }b|B(p)\rangle &=&- i\, \epsilon _{\alpha \beta \rho \sigma }\varepsilon ^{\ast \rho }[(p+k)^{\sigma }g_{+} + q^{\sigma }g_{-}]-(\varepsilon ^{\ast }\!\cdot q)\, \epsilon _{\alpha \beta \rho \sigma }(p+k)^{\rho }q^{\sigma }h\\& & -i [ (p+k)^{\alpha }\epsilon _{\beta \rho \sigma \tau }\varepsilon ^{\ast \rho }(p+k)^{\sigma }q^{\tau }-\alpha \leftrightarrow \beta ]\, h_{1} \ ,\) 
